Any reason to think it's NOT the Throttle Position Sensor? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 16 Old 11-09-2010, 09:43 AM Thread Starter
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Any reason to think it's NOT the Throttle Position Sensor?

I've researched all the threads, my 2007, DL650A has all the classic symptoms:

Warm engine, pull in the clutch, let go of the throttle the tach lands anywhere from 1,400 to 0. It's pretty random. If it's low, you goose the throttle and it lands back at 1,400 until next time.

I did the three full throttle pulls with the key "on" and fuel pump primed, engine not yet satarted and it had no effect good or bad. I've never done this before and noticed an od electrical asound like "nano' with evey throttle pull.

Here's the odd thing: This only started after I installed Oxford heated grips. I didn't touch anything under the airbox, but cleaned and re-installed the air filter. The grips were connected at the battery and they work fine. Disconnected the grips and the problem persists. The grips came with a cheesy multi-pin connector which had a bent pin. After several attemts to straighten it out with tweezers I got it to work. This required several sequences of disconnecting and re-coonecting the battery leads.

I did have this idling problem briefly and to a lesser degree in March. It disappeared after I got the bike back from the dealer who did a major servicing: Throttle Body Synch, Valve Check, Coolant Replacemant, Oil Change, Air Filter Replacement.

I've since put 10,000 miles on the bike with no problems at all until after the grips install.

Is there something I could have inadvertently done in routing the grip wires, under the tank, or is it just coincidence?

Oh, to make it more frustrating my local dealer just told me that the Throttle Position Sensor is on backorder from Suzuki.

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Stromin'Nroman NC28729, USA

DL650A K7 (Greywolf Moto Lab's R&D test mule) June 1, 2012 - present
DL650A K7 April 23, 2007 - January 6, 2012, RIP

"Look here brother, who you jivin' with that cosmik debris?" Frank Zappa, 1975

Last edited by Stromin'Nroman; 11-09-2010 at 09:47 AM.
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post #2 of 16 Old 11-09-2010, 11:15 AM
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I'm going to bet that it's a coincidence.

Here's something I found looking on the parts fiche. There are two throttle position sensors. One for the secondary plates and one for the main plates. They are the same part number so are interchangeable. I wonder if it would be a good test to swap them and see if your problem persists?

I imagine that the primary TPS does more to maintain engine performance than the secondary one does.
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post #3 of 16 Old 11-09-2010, 11:59 AM Thread Starter
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Quote:
Originally Posted by Gramps View Post
I'm going to bet that it's a coincidence.

Here's something I found looking on the parts fiche. There are two throttle position sensors. One for the secondary plates and one for the main plates. They are the same part number so are interchangeable. I wonder if it would be a good test to swap them and see if your problem persists?

I imagine that the primary TPS does more to maintain engine performance than the secondary one does.
I just came in from pulling the tank and having a look-see. There was no obvious chafing of wires or anything like that. I opened the airbiox and it was sealed and the filter re-installed correctly.

I did see in one of the TPS threads that they are the indeed same part and considered the same thing. I'm going to call around and see if anybody has or can get the TPS and go from there. I may be temped to do the swap, but then I may screw up two things instead of just one.

The local dealer only wants $60 to change the part. I've got a Thursday AM appointment with them to look at the Throttle synch, just on the chance it got whaked out.

Philosophically, I have no problem with coincidence, this just seems a little too coincidental.

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Stromin'Nroman NC28729, USA

DL650A K7 (Greywolf Moto Lab's R&D test mule) June 1, 2012 - present
DL650A K7 April 23, 2007 - January 6, 2012, RIP

"Look here brother, who you jivin' with that cosmik debris?" Frank Zappa, 1975
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post #4 of 16 Old 11-09-2010, 12:16 PM
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Nroman, try this link and see if you can correlate:

Moon Phases Calendar / Moon Schedule

Go hakafugu yourself.
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post #5 of 16 Old 11-09-2010, 12:23 PM Thread Starter
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Quote:
Originally Posted by kenneth_moore View Post
Nroman, try this link and see if you can correlate:

Moon Phases Calendar / Moon Schedule
That's about right, it was really cool to see the fingernail moon set last night as I was headed West on HWY 64. Then I came upon a fatal multi-car wreck with an inverted Ford Explorer and had to find an alternate route. I managed to keep the bike from stalling at all the stops along the way.

My hands were toasty.

We're gonna have that beer, Kenneth. If I have to ride on the back of my wife's Harley, we'll have that beer.

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Stromin'Nroman NC28729, USA

DL650A K7 (Greywolf Moto Lab's R&D test mule) June 1, 2012 - present
DL650A K7 April 23, 2007 - January 6, 2012, RIP

"Look here brother, who you jivin' with that cosmik debris?" Frank Zappa, 1975
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post #6 of 16 Old 11-09-2010, 02:01 PM
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That's what you said last year. Sniff.

Go hakafugu yourself.
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post #7 of 16 Old 11-09-2010, 02:17 PM Thread Starter
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Quote:
Originally Posted by kenneth_moore View Post
That's what you said last year. Sniff.
I put the tank back on, checked all the connections took it for a spin for about 10 miles and it ran flawlessly. I only came back because I realized I forgot my wallet.

The only things I did while the tank was off was disconnecting the Primary TPS and spritzing the plug with electrical contact cleaner and making sure the secondaries moved freely and left them fully open.

It was about 35 deg. when I rode the bike this morning and had problems it's mid-sixties now.

I have an appointment at the dealer to have the throttles synched on Thursday and to see what they think.

Ron Ayers is on backorder for the part. I wonder if it could be gooped up or something. The two other dealers in the area said they have never sold the part.

Going out for another spin.

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Stromin'Nroman NC28729, USA

DL650A K7 (Greywolf Moto Lab's R&D test mule) June 1, 2012 - present
DL650A K7 April 23, 2007 - January 6, 2012, RIP

"Look here brother, who you jivin' with that cosmik debris?" Frank Zappa, 1975
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post #8 of 16 Old 11-11-2010, 01:44 PM Thread Starter
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To answer my own question: No.

I took the bike to the local dealer in Hendersonville. They checked the Throttle Body Synch, which checked out. And after some more twiddling came up with the same diagnosis as Greywolf.

Thanks, Pat, it's not easy but you made me look smart.

This dealer, who sees a fair number of Stroms and two other dealers in the area have never sold one of these TPS's for a V-Strom - until now.

They were able to track a Throttle Position Sensor down somewhere and will be overnighting it for installation tomorrow (Friday). Hopefully allowing an on-time departure for my little moto-journey next week and a long promised beer with Kenneth Moore.

I'm not superstitious, but I'm crossing my fingers just in case.

Sent from my Hewlett-Packard 75C, using the Flying Merkel motorcycle app.

Stromin'Nroman NC28729, USA

DL650A K7 (Greywolf Moto Lab's R&D test mule) June 1, 2012 - present
DL650A K7 April 23, 2007 - January 6, 2012, RIP

"Look here brother, who you jivin' with that cosmik debris?" Frank Zappa, 1975
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post #9 of 16 Old 02-10-2011, 11:15 AM
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So can I assume changing the sensor did fix the problem? The last two mornings it was cold here (in the high 20's), and yesterday it sputtered mid corner, and nearly stalled at a traffic light, but I caught it and took off. This morning, turning into the parking lot at work it died almost immediately after pulling in the clutch to shift...so I coasted into my parking spot. I'm thinking I might need a TPS as well.

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post #10 of 16 Old 02-10-2011, 11:31 AM Thread Starter
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Quote:
Originally Posted by RedBean25 View Post
So can I assume changing the sensor did fix the problem?
Indeed it did.

I've got about 3,000 miles on the new sensor.

Not even half a hiccup so far, this after constant stalling when returning to idle on a warmed-up engine with the old one.

It looks like the new sensors are becoming a rare bird stateside.

Sent from my Hewlett-Packard 75C, using the Flying Merkel motorcycle app.

Stromin'Nroman NC28729, USA

DL650A K7 (Greywolf Moto Lab's R&D test mule) June 1, 2012 - present
DL650A K7 April 23, 2007 - January 6, 2012, RIP

"Look here brother, who you jivin' with that cosmik debris?" Frank Zappa, 1975
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